Add "since .." on deprecated things

git-svn-id: https://hudson.dev.java.net/svn/hudson/trunk/hudson/main@21863 71c3de6d-444a-0410-be80-ed276b4c234a

core/src/main/java/hudson/Launcher.java

@@ -118,7 +118,7 @@ public abstract class Launcher {
      *
      * @return
      *      null if this launcher is not created from a {@link Computer} object.
-     * @deprecated
+     * @deprecated since 2008-11-16.
      *      See the javadoc for why this is inherently unreliable. If you are trying to
      *      figure out the current {@link Computer} from within a build, use
      *      {@link Computer#currentComputer()}